refactor: clap version to 4 from 2

Cargo.toml

@@ -8,5 +8,5 @@ description = "A MIPS-32 simulator"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.5.1", features = ["derive"] }
 rand = "0.8.2"
-clap = "2.33.3"

src/cli.rs

@@ -1,25 +1,26 @@
 use std::io::{BufRead, BufReader};
 use std::fs::File;
+use std::path::PathBuf;
 
 use super::token::Tokens;
 use super::token::memory::Memory;
 use super::lexer::tokenize;
 use super::parser::parse;
 
-pub fn run(files: &[&str]) {
+pub fn run(files: &[PathBuf]) {
     let mut tokens: Tokens = Tokens::new();
     let mut memory = Memory::default();
 
     // Join files  =>  Everyone global
     for (filename_idx, file) in files.iter().enumerate() {
         let mut number_of_lines: u32 = 1;
         let mut reader = BufReader::new(File::open(file).expect("Failed file open"));
-        tokens.add_file(file);
+        tokens.add_file(file.to_str().unwrap());
 
         let mut buf = String::new();
         while 0 < reader.read_line(&mut buf).unwrap() {
             if let Err(e) = tokenize(number_of_lines, filename_idx, &buf, &mut tokens) {
-                eprintln!("{}:{}: {}", file, number_of_lines, e);
+                eprintln!("{}:{}: {}", file.display(), number_of_lines, e);
                 std::process::exit(1);
             }
             number_of_lines += 1;

src/main.rs

@@ -1,29 +1,30 @@
-#[macro_use]
-extern crate clap;
-
 mod cli;
 mod lexer;
 mod parser;
 mod repl;
 mod token;
 
-use clap::{Arg, App};
+use std::path::PathBuf;
+use clap::Parser;
+
+#[derive(Parser)]
+#[command(version, about)]
+struct Cli {
+    /// Optional name to operate on
+    #[arg(short, long, value_name = "FILE")]
+    files: Vec<PathBuf>,
+}
 
 fn main() {
-    let matches = App::new("mipsi")
-        .version(crate_version!())
-        .about(crate_description!())
-        .arg(Arg::with_name("file").multiple(true))
-        .get_matches();
+    let cli = Cli::parse();
 
     // REPL
-    if matches.values_of("file").is_none() {
+    if cli.files.is_empty() {
         repl::run();
         return;
     }
 
     // CLI
-    let files: Vec<&str> = matches.values_of("file").unwrap().collect();
-    cli::run(&files);
+    cli::run(&cli.files);
 }